John muephy



p present method for overcoming this difficulty Unirse STATES PATENT Ormea JOHN MURPHY, OF BROOKLYN NEWT YORK. ,l

RUBBER BELTING.

EPECEFICATION forming part of Letters Patent No. 355.834l dated January 11, 1887.

`Application filed October 25, 1886. Serial No. 217,132. (No model.)

which the following is a specification, reference being had to the accompanying drawings. My improvements relate to the method lof covering rubber belting in the course of its manufacture, and refer specially to what is known as seamless covering.77

The object of such invention is to -provide a better protection and greater capacity for wear at the edges of the belting.

In the present method of seamless covering there is a great tendency of the covering to loop away or become loosened from the edges of the inner fabric ofthe belting, arising from the compression brought to bear upon the belting while being cured or vulcanized. The

is to press the belting within a mold of the exactwidth of belting to be produced, so as to assure a close contact of the covering with the edges of the belting while the vulcanizing process is going on, and thus prevent the looping or breaking away at the edges.

My improvements consist in providing a special binding-strip of -thin rubber-coated fabric or material, with which I'cover and inclose the edges ofthe inner portions or layers of the belt, lappingthe said binding-strip well beyond the edges ofthe layers, to secure asafe adhesion. Vith such binding in place a good coating of clear rubber isput on, covering the whole belt on both face and. edges.

There are several methods for applying this covering. The preferable one is to prepare the edge-binding by applying a heavy coat of rubber on one side and a friction-coating on the other. The edge-binding is then applied t0 the edges of the belting, overlapping them well to make a safe and close contact. A sheet of clear rubber is then applied to each face of the belt, overlapping the edge-binding well. The whole is then pressed to an-even thickness and vulcanized. Another method is to coat the edge-binding with a frictioncoating of rubber 'on each side, and applying the same to the sheet-rubber for outer coating,

in such manner that when this sheet is apf lsections of belting embodying my improvements. These sectionsare enlargedto more clearly show the different details of construction and modes of application of the same. Fig. 3 represents a section of iinished belting embodying my improvements.

Similar letters of vreference designate like parts in all of the figures.

In Fig. 1 the edge-binding strip shown at A is represented as extending over the edges of inner belt-section, C, and a short distance over the dat faces. This edge-binding strip A is covered on the outer face with the thicker layer of rubber, B, intended to form a portion of the final outer covering. The por` tion D, covering the dat faces of the belting, is shown overlapping the edge-binding strips at d.

In Fig. 2 a sheet oi' clear rubber is cut to a width sufficient to wrap about the whole belt and overlap, as shown at (1. The edge-binding strips A, having a friction-coating of rubber on both sides, are attached to this prepared wrapping-sheet and the whole applied, the strips covering the edges, as shown at A in Fig. 2, and the sheet coveringY the whole, as shown at D, andjointcd, as shown at d.

lIn either case the belting is pressed or rolled to a close adhesion and tlt surface and the whole vulcanized,\'resulting in a section as appearsin Fig. 3. l

NVhat I claim as new, and desire to secure by Letters Patent, is

1. The improvement in the manufacture of rubber belting which consists in applying to the edges of the inner fabric of the belting a binding-strip of thin rubber-coated mate-y rial, covering the whole with a .coating of clear rubber, and rolling, pressing, and vulcanizing the same, substantially as set forth.

2. In combination with the inner layers of to the edges of the inner fabric of the belt, V a belt, an edge-binding of thin rubber-coated substantially as and for the purposes speci- 1o fabric or material and an outer protective fled. 4 coverinfr of clear rubber substantially as 5 shown aand described'. JQHN MURPHY 8. In combination with the several portions Witnesses:

of a rubber belt, abinding-stri p of thin rubber- TERENOE J. MORRIS, coated fabric or material attached immediately 1 WM. H. WEIGHTMAN. 

